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**RUN GPROBCNT(***x*,*y*<,*p*>**);**

The inputs to the GPROBCNT subroutine are as follows:

*x*- is any
*n*×*m*matrix of*x*-values. *y*- is a corresponding
*n*×*m*matrix of*y*-values. *p*- is an optional probability value matrix.

The GPROBCNT module draws one contour curve
corresponding to each value in the matrix *p*,
which must contain entries between zero and one.
If you do not specify the matrix *p*, contours for
the probability values of 0.5, 0.8 and 0.9 are drawn.
You cannot produce graphics until
you invoke the CALL GSTART statement.
The contour plot remains open for further
additions until you specify the CALL GCLOSE statement,
which terminates the current graphics segment.
Note that this module cannot be used for
general contour plots of three-dimensional data.

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